Shigure Soen Ryu

Shigure Soen Ryu - or The Invicible Sword Style - is called as such for several reasons. This technique, branches out in a similar fashion to a family tree through it's successors. It started out with one man learning the techniques and as he passed it down more techniques were added through the generations. As such each generation would create a new technique, different from the others that came before it and currently exist within the sword style and varies depending on the master using it. This is resultant to their being several different forms of the Shigure Soen form.

This is a notably deadly Sword Form and is only passed down to worthy successors and can only be used by those potent enough to learn how. Each 'form' is only shown to the successor once by the previous generation and if the student is liable enough to be a worthy successor, then he or she will be able to remember the 'forms' without being shown ever again. At the origins of the form, only one 'form' was passed down through the generations, with each successor adding their own form to it each time, resulting in the many different forms of Shigure Soen. Because of new forms being created, the weaker ones were eventually removed from the style and only the stronger ones remained, this being the reasoning behind why it is considered the most powerful and flawless sword style.

The Shigure Soen shown to Yamamoto had 8 different forms; 4 offensive and 4 defensive and uses his father Shigure Kintoki.